JP2013205514A - Light control sheet, fixture, and building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light control sheet which changes a traveling direction of light impinging from one side to transmit the light to the other side.SOLUTION: A light control sheet 20 has first refractive index interfaces 21 and second refractive index interfaces 22 for reflecting light impinging from one side. The first refractive index interfaces and the second refractive index interfaces are alternately arrayed in one direction. Each of the first and second refractive index interfaces has a higher refractive index on one side in the one direction than on the other side. A distance between any first refractive index interface and a second refractive index interface arranged in a position adjacent to the first refractive index interface on the other side in the one direction increases from one side toward the other side.

Description

  The present invention relates to a light control sheet that changes the traveling direction of light incident from one side and transmits the light to the other side. The present invention also relates to a joinery and a building including a light control sheet that changes the traveling direction of light incident from one side and transmits the light to the other side.

  Conventionally, a light control sheet that changes the traveling direction of light incident from one side and transmits the light to the other side is known. For example, Patent Document 1 discloses an example in which such a light control sheet is applied to a window. The incident direction of light incident on the window varies depending on the season. However, the light incident on the building through the window, such as when it is desired to prevent sunlight from being irradiated on the display surface of the display device placed in the building or cultural articles placed in the building, In some cases, it may be desirable not to proceed in a particular direction within the building, regardless of the direction of incidence on the window. In addition, when trying to save energy by using sunlight as illumination light, the light that enters the building through the window may travel in a specific direction within the building regardless of the direction of incidence on the window. preferable.

  In addition, it is not limited to a window that transmits sunlight, and it is desired that the traveling direction of light incident along one or more directions from one side is changed to a desired direction and transmitted to the other side. Sometimes.

JP 2010-259406 A

  The present invention has been made in consideration of the above points, and is a light control sheet that changes the traveling direction of light incident from one side and transmits the light to the other side, and a fitting and a building having the light control sheet. The purpose is to provide.

The first light control sheet according to the present invention is:
A light control sheet that changes the traveling direction of light incident from one side and transmits it to the other side,
A first refractive index interface for reflecting light incident from the one side, and a plurality of first refractive index interfaces arranged in one direction;
A second refractive index interface for reflecting light incident from the one side, and a plurality of second refractive index interfaces arranged in the one direction,
Along the one direction, the first refractive index interface and the second refractive index interface are alternately arranged,
The first refractive index interface is configured such that the refractive index on one side in the one direction is higher than the refractive index on the other side;
The second refractive index interface is configured such that the refractive index on one side in the one direction is higher than the refractive index on the other side;
An arbitrary first refractive index interface and a second refractive index interface disposed at a position adjacent to the first refractive index interface from one side in the one direction are directed from the one side to the other side. Approaching,
An arbitrary first refractive index interface and a second refractive index interface arranged at a position adjacent to the first refractive index interface from the other side in the one direction are directed from the one side to the other side. Keep away.

  In the first light control sheet according to the present invention, the first refractive index interface, the second refractive index interface disposed at a position adjacent to the first refractive index interface from the other side in the one direction, and the light control. In a region surrounded by the surface of the other side of the sheet, light in a specific wavelength region is absorbed or reflected to suppress transmission of light in the specific wavelength region from the one side to the other side. A selective light blocking unit may be provided.

  In the first light control sheet according to the present invention, the plurality of first refractive index interfaces may be arranged to be parallel to each other, and the plurality of second refractive index interfaces may be arranged to be parallel to each other. .

  In the first light control sheet according to the present invention, the first refractive index interface and the second refractive index interface may be a flat surface, a curved surface, or a folded surface.

The second light control sheet according to the present invention is:
A light control sheet that changes the traveling direction of light incident from one side and transmits it to the other side,
A sheet-like body,
A plurality of first portions arranged along one direction on the main body, wherein each first portion is located on one side in one direction and on the other side in the one direction. A plurality of first portions having other sides;
A second portion that contacts the one side surface and the other side surface of the plurality of first portions to form an interface;
A third portion provided at a position between the two first portions adjacent to each other in the one direction and forming an interface in contact with the second portion provided on the two first portions. ,
At the interface between the first part and the second part, the refractive index on the first part side is higher than the refractive index on the second part side,
At the interface between the second part and the third part, the refractive index on the third part side is higher than the refractive index on the second part side,
In the two first portions adjacent in the one direction, the other side surface of the first portion located on one side in the one direction and the one side surface of the first portion located on the other side in the one direction are: The one side is separated from the other side.

  In the second light control sheet according to the present invention, the third portion absorbs or reflects light in a specific wavelength range and suppresses transmission of light in the specific wavelength range from the one side to the other side. A selective light-shielding part may be included.

  In the second light control sheet according to the present invention, the plurality of first portions may have the same shape.

  In the second light control sheet according to the present invention, the one side surface and the other side surface may be a flat surface, a curved surface, or a folded surface.

  In the second light control sheet according to the present invention, the first part, the second part, and the third part may have visible light permeability.

  2nd light control sheet by this invention WHEREIN: The said 3rd part further has the main part (filling part) arrange | positioned in the position enclosed by the said 2nd part and the said selection light-shielding part, The said selection light-shielding part May be arranged at a position forming the surface of the other side of the light control sheet.

  In the second light control sheet according to the present invention, the second portion may be provided also on a surface on the other side of the first portion that connects the one side surface and the other side surface.

The joinery according to the present invention is:
Any of the light control sheets according to the invention described above;
A frame that supports the light control sheet.

  A building comprising the light control sheet according to any one of claims 1 to 6 or the joinery according to claim 7.

  According to the present invention, the traveling direction of light incident along two or more directions from one side can be changed to a desired direction and transmitted to the other side.

FIG. 1 is a perspective view showing a light control sheet for explaining an embodiment according to the present invention. FIG. 2 is a view showing the light control sheet of FIG. 1 in a cross section along both the normal direction and the arrangement direction of unit elements (first to third portions, first and second refractive index interfaces). . FIG. 3 is a perspective view showing a joinery and a building in which the light control sheet of FIG. 1 is incorporated. FIG. 4 is a diagram for explaining an example of a method for manufacturing the light control sheet of FIG. 1. FIG. 5 is a diagram for explaining an example of a method for manufacturing the light control sheet of FIG. 1. FIG. 6 is a diagram for explaining an example of a method for manufacturing the light control sheet of FIG. 1. FIG. 7 is a cross-sectional view corresponding to FIG. 2 and is a view for explaining a modification of the light control sheet. FIG. 8 is a cross-sectional view corresponding to FIG. 2 for explaining another modification of the light control sheet. FIG. 9 is a cross-sectional view corresponding to FIG. 2 and is a view for explaining still another modification of the light control sheet.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product.

  FIGS. 1-6 is a figure for demonstrating one Embodiment by this invention. Among these, FIG. 1 and FIG. 2 are a perspective view and a longitudinal sectional view showing the light control sheet. FIG. 3 is a perspective view showing a joinery having a light control sheet and a building. 4-6 is a figure for demonstrating the manufacturing method of a light control sheet | seat.

  In addition, in the example demonstrated below, the example which applied the light control sheet | seat 20 to the fitting 15 integrated in the building 10 is shown. However, the following description is only an example, and the light control sheet 10 can be used for applications other than the joinery 15 and the building 10.

  In the example shown in FIG. 3, the building 10 has a joinery 15 as a window. The joinery 15 includes a frame body 18 and a light control sheet 20 held by the frame body 18. The light control sheet 20 is formed in a rectangular shape, and the frame 18 extends so as to surround the periphery of the rectangular light control sheet 20. As shown in FIGS. 1 and 2, the light control sheet 20 has a first refractive index interface 21 and a second refractive index interface 22 for reflecting, in particular, totally reflecting light incident from one side. doing. The first refractive index interface 21 and the second refractive index interface 22 are alternately arranged in one direction. The light incident on the light control sheet 20 from one side is reflected by the first refractive index interface 21 or the second refractive index interface 22, particularly totally reflected to change the traveling direction and pass through the light control sheet 20.

  As described below, the light control sheet 20 changes the traveling direction of light incident along two or more directions from one side (outside of the building) to a desired direction, respectively, and changes the other side ( Permeate inside the building). More specifically, the sunlight L22 in summer when the incident angle to the light control sheet 20 (the angle formed by the traveling direction of the incident light with respect to the normal direction to the sheet surface of the light control sheet 20) θa is the largest. The winter sunlight L21 having the smallest incident angle θa on the light control sheet 20 is directed in substantially the same direction regardless of the difference in incident angle.

  In the present specification, terms such as “sheet”, “film”, and “plate” are not distinguished from each other only based on the difference in names. Therefore, for example, a “sheet” is a concept including a member that can also be called a film or a plate. As a specific example, the “light control sheet” includes members called “light control film”, “light control plate”, and the like.

  In this specification, “sheet surface (film surface, plate surface)” is the same as the planar direction of the target sheet-like member when the target sheet-like member is viewed as a whole and globally. It refers to the surface to be used.

  Furthermore, terms used in the present specification for specifying shapes and geometric conditions, for example, terms such as “parallel”, “orthogonal”, “symmetric”, “trapezoid” and the like are not restricted to strict meanings. Therefore, it should be interpreted including an error to the extent that a similar optical function can be expected.

  Hereinafter, the configuration and operational effects of the light control sheet 20 will be described in more detail. As shown in FIGS. 1 and 2, the light control sheet 20 includes a sheet-like main body 25, and a large number of first portions 30, second portions 35, and 3 portions 40.

  The main body 25 is a layer that supports the first portion 30, the second portion 35, and the third portion 40, and is appropriately configured so as to have appropriate strength and appropriate transparency. In the illustrated example, the surface on one side of the main body portion 25 forms one side surface 20 a of the light control sheet 20. As an example, the thickness of the main body 25 can be 20 μm to 200 μm. As such a main body 25, for example, a biaxially stretched polyethylene terephthalate (PET) film can be used. The biaxially stretched polyethylene terephthalate film is suitable for application as the main body 25 in that it has moderate transparency and durability against ultraviolet irradiation treatment, heat treatment, and the like.

  The first portions 30 are arranged on the main body portion 25 along one direction da parallel to the sheet surface of the light control sheet 20. The second portion 35 and the third portion 40 are disposed between the two adjacent first portions 30. Therefore, the second portion 35 and the third portion 40 are also arranged in one direction da that is the arrangement direction of the first portions 30. Hereinafter, one direction that is the arrangement direction of the first portion 30, the second portion 35, and the third portion 40 is also simply referred to as an “arrangement direction”.

  As shown in FIG. 1, the first portion 30, the second portion 35, and the third portion 40 extend linearly in a direction that intersects the arrangement direction da and is parallel to the sheet surface of the light control sheet 20. ing. In particular, in the illustrated example, the first portion 30, the second portion 35, and the third portion 40 extend linearly in a direction orthogonal to the arrangement direction da.

  As shown in FIGS. 1 and 2, each first portion 30 has one side surface 31 located on one side (upper side in FIGS. 1 and 2) in the arrangement direction da and the opposite side to one side in the arrangement direction da. And the other side surface 32 located on the other side (lower side in FIGS. 1 and 2). Of the two first portions 30 adjacent to each other in the arrangement direction da, the other side surface 32 of the first portion 30 located on one side along the arrangement direction da and the first side located on the other side along the arrangement direction da. The one side 31 of the portion 30 is separated from one side toward the other side.

  Here, “to be separated from one side toward the other side” means that the other side surface 32 of the first portion 30 located on one side and the one side of the first portion 30 located on the other side. It is not necessary for the side surface 31 to be continuously spaced from one side to the other side, and in part, the interval may be constant. That is, “to be separated from one side toward the other side” means that the other side surface 32 of the first portion 30 located on one side and the one side surface 31 of the first portion 30 located on the other side. Means that it does not approach from one side to the other.

  The second portion 35 is disposed on the first portion 30 in contact with the one side surface 31 and the other side surface 32 so as to cover at least a portion of the one side surface 31 of the first portion 30 and at least a portion of the other side surface 32. . The third portion 40 is provided at a position between the two first portions 30 adjacent in the arrangement direction da. The third portion 40 is disposed on the second portion 35 in contact with the second portion 35 so as to cover at least a part of the second portion 35 provided on the first portion 30.

  In the illustrated example, as shown in FIG. 2, in the cross section along the normal direction to the sheet surface of the light control sheet 20 and the arrangement direction da (hereinafter, also referred to as a main cut surface), the first portion 30 has a trapezoidal shape. One side surface 31 and the other side surface 32 of the first portion 30 form a trapezoidal side surface. A trapezoid-shaped lower bottom forming the first portion 30, that is, one side surface 30 a of the first portion 30 is disposed on the other side surface of the main body portion 25, and a trapezoid-shaped upper bottom forming the first portion 30; That is, the other side surface 30 b of the first portion 30 forms the other side surface 20 b of the light control sheet 20.

  In the illustrated example, one side surface 31 of the light control sheet 20 extends in parallel to the normal direction to the sheet surface of the light control sheet 20. Further, the cross-sectional shape of the first portion 30 is constant along the longitudinal direction. Further, the plurality of first portions 30 included in the light control sheet 20 are configured identically to each other. The first portion 30 is disposed on the main body 25 without leaving a gap in the arrangement direction da. Therefore, the surface of the other side of the main body 25 is covered with the first portion 30 over the entire surface.

  In the example shown in FIG. 2, the second portion 35 covers the entire surface of one side 31 of the first portion 30. The second portion 35 extends on one side 31 of the first portion 30 with a constant thickness. In the illustrated example, the second portion 35 covers the entire other side 32 of the first portion 30. The second portion 35 extends on the other side 32 of the first portion 30 with a constant thickness. Furthermore, in the illustrated example, the second portion 35 is adjacent to the other side surface 32 of the first portion 30 located on one side of the two first portions 30 adjacent to each other in the arrangement direction da and to the arrangement direction da. It extends continuously on the side surface 31 of the first portion 30 located on the other side of the two matching first portions 30 with a certain thickness.

  That is, the surface of the first portion 30 provided on the main body portion 25 is covered with the second portion 35 except for the other side surface 30b that forms the upper base of the trapezoidal shape on the main cut surface. In other words, in the main cut surface of the light control sheet 20, the second portion 35 is V opened from one side to the other side between two adjacent first portions 30 along the arrangement direction da. It is formed in a letter shape. And the 2nd part 35 has comprised a part of other side surface 20b of the light control sheet 20 in the position used as the both ends of V shape.

  In the illustrated example, the cross-sectional shape of the second portion 35 is constant along the longitudinal direction. Further, the plurality of second portions 35 included in the light control sheet 20 are configured identically to each other.

  The third portion 40 provided at a position between the two first portions 30 adjacent to each other in the arrangement direction da is disposed inside the V-shaped second portion 35 in the illustrated example. That is, in the illustrated example, the third portion 40 is configured as a triangular shape, particularly in the illustrated example, as a right triangle shape, as a portion filling the inside of the V-shape defined by the second portion 35. Yes. The third portion 40 is in contact with the second portion 35 on two sides of the triangular shape, and forms the other side surface 20b of the light control sheet 20 on the remaining one side.

  In the illustrated example, the cross-sectional shape of the third portion 40 is constant along the longitudinal direction. Further, the plurality of third portions 40 included in the light control sheet 20 are configured identically.

  The main body 20, the first portion 30, the second portion 35, and the third portion 40 are formed of a resin material having visible light permeability. Further, the resin material forming the first portion 30, the second portion 35 and the third portion 40 has a refractive index on the first portion 30 side at the interface between the first portion 30 and the second portion 35. And the refractive index on the third portion 40 side is higher than the refractive index on the second portion 35 side at the interface between the second portion 35 and the third portion 40. Has been determined.

  As described above, the light control sheet 20 has the first refractive index interface 21 and the second refractive index interface 22 for reflecting the light incident from one side and changing the traveling direction thereof. In the illustrated example, the first refractive index interface 21 is configured as an interface between the first portion 30 and the second portion 35 located on the other side surface 32 of the first portion 30. The second refractive index interface 22 is configured as an interface between the second portion 35 located on one side 31 of the first portion 30 and the third portion 40 provided on the second portion 35. Yes.

  Therefore, each of the first refractive index interface 21 and the second refractive index interface 22 has a refractive index on one side in the arrangement direction da higher than the refractive index on the other side. The first refractive index interface 21 and the second refractive index interface 22 are arranged in the arrangement direction da so as to be alternated. The first refractive index interface 21 and the second refractive index interface 22 disposed at a position adjacent to the first refractive index interface 21 from one side in the arrangement direction da are directed from one side to the other side. And approach. The first refractive index interface 21 and the second refractive index interface 22 disposed at a position adjacent to the first refractive index interface 21 from the other side in the arrangement direction da are separated from one side toward the other side. I will do it.

  Here, “approaching from one side to the other side” means that the target first refractive index interface 21 and second refractive index interface 22 are from one side to the other side. It is not necessary to keep approaching constantly, and in some cases, the interval may be constant. That is, “approaching from one side to the other side” means that the target first refractive index interface 21 and second refractive index interface 22 are separated from one side to the other side. It means not to do. Similarly, “to be separated from one side to the other side” as used herein means that the first refractive index interface 21 and the second refractive index interface 22 to be processed are from one side to the other side. It is not always necessary to keep moving away from each other, and in some cases, the interval may be constant. That is, “to be separated from one side toward the other side” means that the target first refractive index interface 21 and second refractive index interface 22 approach from one side to the other side. It means not to do.

  In the illustrated example, the first refractive index interface 21 and the second refractive index interface 22 intersect the arrangement direction da corresponding to the configuration of the first portion 30, the second portion 35, and the third portion 40 described above. It extends in the direction to do. In particular, in the example described here, the first refractive index interface 21 and the second refractive index interface 22 are formed as planes and extend linearly in a direction orthogonal to the arrangement direction da. The plurality of first refractive index interfaces 21 are arranged so as to be parallel to each other. Similarly, the plurality of second refractive index interfaces 22 are also arranged so as to be parallel to each other. Further, the first refractive index interfaces 21 are configured identically. Similarly, the plurality of second refractive index interfaces 22 are also configured identically.

  By the way, the third portion 40 is formed in a region surrounded by the first refractive index interface 21, the second refractive index interface 22, and the other side surface 20 b of the light control sheet 20. The third portion 40 is provided with a selective light-shielding portion 41 that absorbs or reflects light in a specific wavelength range and restricts transmission of light in the specific wavelength range from one side to the other side. . That is, the selective light blocking unit 41 restricts the light in the specific wavelength range incident on the third portion 40 from being transmitted through the light control sheet 20 as it is.

  In the example described here, the third portion 40 includes an additive that absorbs or reflects infrared rays (concepts including near infrared rays) as light in a specific wavelength range, for example, light in a wavelength range of 700 nm to 2000 nm. Therefore, in this example, the 3rd part 40 comprises the selective light-shielding part 41 as a whole, and controls that the infrared rays which injected into the 3rd part 40 permeate | transmit from the light control sheet 20 to the other side. be able to. In addition, it does not specifically limit as an additive which absorbs or reflects the light of a specific wavelength range, A various well-known additive can be used.

  Note that the reflection at the first refractive index interface 21 is preferably total reflection caused by the difference in refractive index between the portions forming both sides of the interface. Similarly, the reflection at the second refractive index interface 22 is also preferably total reflection due to the difference in refractive index between portions on both sides of the interface. According to the total reflection, no reflection loss occurs, and light can pass through the light control sheet 20 with high transmittance. From the viewpoint of causing total reflection at the first refractive index interface 21, the refractive index on the first portion 30 side is 0.1 or more than the refractive index on the second portion 35 side in the first refractive index interface 21. It is preferable that it is high. From the viewpoint of causing total reflection at the second refractive index interface 22, the refractive index on the third portion 40 side is 0.1 or more than the refractive index on the second portion 35 side in the second refractive index interface 22. It is preferable that it is high.

In addition, when the present inventors conducted intensive experiments, in the main cut surface of the light control sheet, the width Wa at one end portion (light emission side end portion) of the first portion 30 along the arrangement direction da, The width Wb at the other end (light emission side end) of the first portion 30 along the arrangement direction da and the height H of the first portion 30 along the normal direction nd to the light control sheet It was found that it is preferable to satisfy the following relationship when rounded off to the first decimal place.
2.0 ≦ H / Wa ≦ 5.0
1.5 ≦ Wa / Wb ≦ 3.5
When the 1st part 30 is designed so that the above relationship may be satisfy | filled, while being able to show | play effectively the effect mentioned later, the light control sheet | seat 20 can be produced cheaply by shaping.

  The light control sheet 20 having the above configuration can be manufactured as follows as an example.

  First, the first part 30 is a first part constituent composition that becomes a part of the first part 30 by being cured, for example, an epoxy acrylate prepolymer having a feature of being cured by ionizing radiation such as an electron beam or ultraviolet rays. Or the like. Specifically, it corresponds to the mold roll having convex portions corresponding to the configuration (arrangement, shape, etc.) of the second portion 35 and the third portion 40, in other words, corresponding to the configuration (arrangement, shape, etc.) of the first portion 30. A mold roll having a recess is prepared. A base sheet that forms the main body portion 25 is fed between the mold roll and the nip roll, and the first partial constituent composition is placed between the mold roll and the base sheet in accordance with the feeding of the base sheet. Supply. Thereafter, the first partial constituent composition is pressed with a mold roll and a nip roll so that the liquid first partial constituent composition supplied onto the base sheet is filled in the concave portion of the mold roll. At this time, by supplying the first partial constituent composition onto the base sheet so as to be thicker than the depth of the concave portion of the mold roll, that is, so as not to contact the mold roll and the base sheet, The sheet-like portion formed integrally with the one portion 30 forms the main body portion 25 together with the base material sheet. After filling the uncured and liquid first partial constituent composition between the base sheet and the mold roll in this way, the first partial constituent composition is cured (solidified) by irradiation with ionizing radiation. Accordingly, as shown in FIG. 4, the first portion 30 can be formed on the main body portion 25.

  Next, as shown in FIG. 5, a second partial constituent composition that forms the second portion 35 by curing is applied onto the surface of the first portion 30. As the second partial constituent composition, for example, an ionizing radiation curable resin having a characteristic of being cured by ionizing radiation such as an electron beam and ultraviolet rays can be used. Various known coating methods can be used as a coating method of the second partial constituent composition, and dip coating can be used as an example. According to dip coating, the second partial constituent composition can be applied on the surface of the first portion 30 with a substantially uniform thickness as shown in FIG.

  Then, the 2nd partial constituent composition applied on the other side 30b of the 1st portion 30 is scraped off, for example by wiping. Thereby, as shown in FIG. 6, the second partial constituent composition is applied only on one side surface 31 and the other side surface 32 of the surface of the first portion 30. In this state, the second part 35 can be formed on the first part 30 by irradiating the second part constituent composition with ionizing radiation to cure (solidify) the second part constituent composition.

  Finally, a third part constituent composition that will form the third part 40 by curing is applied onto the second part 35. As the third partial composition, for example, a resin to which an additive having a property of selectively absorbing or reflecting light in a specific wavelength range (infrared rays in this example) is added, for example, an electron beam, ultraviolet rays, etc. An ionizing radiation curable resin having a characteristic of being cured by ionizing radiation can be used. Various known coating methods can be used as a coating method for the third partial constituent composition, and die coating can be used as an example.

  Specifically, first, the third partial constituent composition is supplied onto the first part 30 and the second part 35 formed in advance. Thereafter, a groove formed between the adjacent first portions 30, that is, the inside of the V-shaped second portion 35 is filled with the third partial constituent composition while using a doctor blade, and the outside of the groove The excess third part constituent composition overflowing to the surface is scraped off. Then, the 3rd part 40 is formed by irradiating and hardening an ionizing radiation to a 3rd partial constituent composition. Thereby, the light control sheet 20 having the main body portion 25 and the first portion 30, the second portion 35, and the third portion 40 arranged in a stripe shape on the main body portion 25 is manufactured.

  Next, the effect in the case where the light control sheet 20 configured as described above is used for the joinery 15 of the building 10 will be described. In the following description, as shown in FIGS. 2 and 3, the sheet surface of the light control sheet 20 (in other words, the arrangement direction da) is parallel to the vertical direction (vertical direction), and one side of the arrangement direction da is It is assumed that the light control sheet 20 is arranged so that it is the upper side in the vertical direction and the other side of the arrangement direction da is the lower side in the vertical direction.

  In general, since the rotation axis when the earth rotates is inclined with respect to the rotation axis when the earth revolves, the position of the sun as seen from the earth changes as the season changes. Considering Japan as a standard, as shown in FIG. 2, the sunlight L21 in the winter season has a smaller incident on the light control sheet 20 set up in the vertical direction than the sunlight L22 in the summer season. It enters at an angle (angle formed by the normal direction to the sheet surface of the light control sheet 20 and the incident direction of light) θa.

  As described above, the arbitrary first refractive index interface 21 and the second refractive index interface 22 arranged at a position adjacent to the first refractive index interface 21 from one side in the arrangement direction da are from one side to the other. An arbitrary first refractive index interface 21, and a second refractive index interface 22 arranged at a position adjacent to the first refractive index interface 21 from the other side in the arrangement direction da, Are spaced from one side to the other side. Further, in the two first portions 30 adjacent to each other in one direction, the other side surface 32 of the first portion 30 located on one side in the arrangement direction da and the one side surface of the first portion 30 located on the other side in the arrangement direction da. 31 is separated from one side toward the other side. In particular, in this example, the first portions 30 are arranged in the arrangement direction da so that the adjacent first portions 30 are diffused. Therefore, the lights L21 and L22 that have entered the light control sheet 20 from one side are likely to enter the first refractive index interface 21 first.

  First, the light path of the light L21 in winter will be examined. As shown in FIG. 2, the light L <b> 21 is refracted when entering the light control sheet 20, and then enters the first refractive index interface 21. The winter light L21 travels in a direction that is relatively largely inclined with respect to the sheet surface of the light control sheet 20 that is set up in the vertical direction. Further, the light L21 is further controlled by refraction upon incidence on the light control sheet 20. The sheet 20 is refracted in a direction that is largely inclined with respect to the sheet surface. For this reason, the winter light L21 is reflected, particularly totally reflected, at the first refractive index interface 21 extending in the horizontal direction perpendicular to the sheet surface of the light control sheet 20. The winter light L21 whose traveling direction is greatly changed by reflection at the first refractive index interface 21 is then emitted from the light control sheet 20 through the other side surface 20b.

  Next, the optical path of the summer light L22 will be examined. As shown in FIG. 2, the summer light L <b> 22 is also refracted when entering the light control sheet 20, and then enters the first refractive index interface 21. However, the summer light L22 is incident on the light control sheet 20 from a direction in which the angle formed with respect to the sheet surface of the light control sheet 20 is smaller than that of the winter light L21, that is, at a larger incident angle θa. To do. Therefore, the incident angle θb when the summer light L22 is incident on the first refractive index interface 21 extending in the horizontal direction perpendicular to the sheet surface of the light control sheet 20 is the first refractive index interface of the winter light L21. 21 is greater than the incident angle θb. For this reason, the summer light L22 is incident on the first refractive index interface 21 at an incident angle θb larger than the total reflection critical angle. As a result, most of the summer light L <b> 22 passes through the first refractive index interface 21 without being totally reflected at the first refractive index interface 21.

  The summer light L <b> 22 that has passed through the first refractive index interface 21 travels toward the second refractive index interface 22. The summer light L22 gradually separates from the one side to the other side of the main cut surface with respect to the first refractive index interface 21 extending in the horizontal direction. Therefore, as shown in FIG. 2, the incident angle θc of the summer light L22 to the second refractive index interface 22 is larger than the incident angle θb of the summer light L22 to the first refractive index interface 21. For this reason, the summer light L22 is reflected, in particular, totally reflected at the second refractive index interface 22. The summer light L22 whose traveling direction is greatly changed by reflection at the second refractive index interface 22 is then emitted from the light control sheet 20 via the other side surface 20b.

  As described above, the winter light L21 traveling in the direction inclined more greatly with respect to the sheet surface of the light control sheet 20 is reflected by the first refractive index interface 21 extending in the normal direction of the light control sheet 20, and light control is performed. The summer light L22 that is inclined to be smaller with respect to the sheet surface of the sheet 20 is reflected by the second refractive index interface 22 that is inclined downward from the light control sheet 20 from one side to the other side. . Therefore, the difference in the traveling direction of the winter light L21 and the summer light L22 after passing through the light control sheet 20 is different from the difference in the traveling direction of the winter light L21 and the summer light L22 before entering the light control sheet 20. Compared with, it can be made much smaller. In particular, in the example shown in FIG. 2, the traveling direction of the winter light L21 after passing through the light control sheet 20 is substantially the same as the traveling direction of the summer light L22 after passing through the light control sheet 20. Yes.

  According to such a light control sheet 20, the light path is changed so that the winter light L21 and the summer light L22 that inevitably have different incident angles θa on the light control sheet 20 travel in substantially the same direction. Make it transparent. That is, according to the light control sheet 20, the light L21 and L22 can be taken into the building 10 by adjusting the optical path so that the winter light L21 and the summer light L22 travel in the same direction. Thereby, the brightness distribution inside the building 10 can be made the same regardless of the season. Therefore, for example, regardless of the season, light outside the building 10 can be effectively taken as illumination light to save energy. Moreover, it is possible to prevent light outside the building 10 from being inserted into a predetermined position inside the building 10, for example, a display surface of the display device or an article that can be deteriorated by light, regardless of the season. Become.

  By the way, the 3rd part 40 in which the summer light L22 injects and the winter light L21 does not enter has the function to absorb or reflect infrared rays as the selection light-shielding part 41. In other words, the infrared rays contained in the summer light L22 are absorbed by the third portion 40, or return to one side of the light control sheet 20 as indicated by a dotted line in FIG. 2 (optical path L22a). That is, it is possible to effectively prevent infrared rays from entering the building 10 from the outside to the inside in summer. Thereby, it can suppress effectively that the temperature inside a building 10 rises in the summertime due to the infrared rays from the outside of the building 10.

  As described above, according to the present embodiment, it is possible to change the traveling direction of light incident along one or more directions from one side to a desired direction and transmit the light to the other side. Become.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, an example of modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted.

  In the above-described embodiment, the example in which the third portion 40 is configured to form the selective light-shielding portion 41 as a whole has been described, but the present invention is not limited to this. For example, as shown in FIG. 7, the third portion 40 may further include a main portion (filling portion) 42 disposed at a position surrounded by the second portion 35 and the selective light shielding portion 41. In the example shown in FIG. 7, the third portion 40 is located between the selective light-shielding portion 41 that forms the other side surface 20 b of the light control sheet 20 and the two first portions 30 that are adjacent in the arrangement direction da. And a main portion 42 filled in a gap defined by the second portion 35. In such an example, the material of the main portion 42 of the third portion 40 and the material of the selective light-shielding portion 41 can be appropriately selected so as to provide functions suitable for each.

  In the above-described embodiment, the example in which the second portion 35 is provided only on the one side surface 31 and the other side surface 32 of the first portion 30 is shown. However, as shown in FIG. 8, the second portion 35 may be provided on the other side surface 30 b of the first portion 30 in addition to the one side surface 31 and the other side surface 32 of the first portion 30. .

  Furthermore, in the above-described embodiment, the example in which the first portion 30 is provided on the other side surface of the main body portion 25 along the arrangement direction da with no gap is shown. However, as shown in FIG. 9, the first portion 30 may be provided on the other side surface of the main body portion 25 with a gap. In the example shown in FIG. 7, the second portion 35 is formed on a portion of the other side surface of the main body portion 25 that is not covered with the first portion 30. However, instead of the example shown in FIG. 7, the third portion 40 may be formed on a portion of the other side surface of the main body 25 that is not covered with the first portion 30. In the above-described embodiment, the example in which the first portions 30 are arranged at a constant pitch in one direction da has been described. However, the arrangement pitch of the first portions 30 may be changed.

  Furthermore, in the above-described embodiment, the example in which the plurality of first portions 30, the plurality of second portions 35, and the plurality of third portions 40 are configured identically to each other has been described. Not limited. One or more of the plurality of first portions 30, the plurality of second portions 35, and the plurality of third portions 40 may be configured to be different from each other. Similarly, in the above-described embodiment, the example in which the plurality of first refractive index interfaces 21 are configured to be the same is shown. However, the present invention is not limited thereto, and the plurality of first refractive index interfaces 21 are different from each other. It may be configured. In the above-described embodiment, the example in which the plurality of second refractive index interfaces 22 are configured to be the same as each other has been described. However, the present invention is not limited thereto, and the plurality of second refractive index interfaces 22 are different from each other. It may be configured.

  Furthermore, in the above-described embodiment, the example in which the first refractive index interface 21 and the second refractive index interface 22 are formed as planes has been described, but the present invention is not limited thereto. One or more of the first refractive index interface 21 and the second refractive index interface 22 may be configured as a curved surface or a bent surface. Similarly, in the above-described embodiment, the example in which the one side surface 31 and the other side surface 32 of the first portion 30 are formed as flat surfaces has been described, but the present invention is not limited thereto. One or more of the side surface 31 and the other side surface 32 of the first portion 30 may be configured as a curved surface or a folded surface.

  In addition, although the some modification with respect to embodiment mentioned above was demonstrated above, naturally, it is also possible to apply combining several modifications suitably.

DESCRIPTION OF SYMBOLS 10 Building 15 Joiner 18 Frame 20 Light control sheet 20a One side surface, incident light side surface 20b The other side surface, light exit side surface 21 First refractive index interface 22 Second refractive index interface 25 Main body 30 First portion 30a The other side surface 31 The one side surface 32 The other side surface 35 The second portion 40 The third portion 41 The selective light shielding portion 42 The main portion and the filling portion

Claims (8)

A light control sheet that changes the traveling direction of light incident from one side and transmits it to the other side,
A first refractive index interface for reflecting light incident from the one side, and a plurality of first refractive index interfaces arranged in one direction;
A second refractive index interface for reflecting light incident from the one side, and a plurality of second refractive index interfaces arranged in the one direction,
Along the one direction, the first refractive index interface and the second refractive index interface are alternately arranged,
The first refractive index interface is configured such that the refractive index on one side in the one direction is higher than the refractive index on the other side;
The second refractive index interface is configured such that the refractive index on one side in the one direction is higher than the refractive index on the other side;
An arbitrary first refractive index interface and a second refractive index interface disposed at a position adjacent to the first refractive index interface from one side in the one direction are directed from the one side to the other side. Approaching,
An arbitrary first refractive index interface and a second refractive index interface arranged at a position adjacent to the first refractive index interface from the other side in the one direction are directed from the one side to the other side. A light control sheet that moves away.   By the first refractive index interface, the second refractive index interface disposed at a position adjacent to the first refractive index interface from the other side in the one direction, and the surface of the other side of the light control sheet, The selective light-shielding unit that absorbs or reflects light in a specific wavelength range and suppresses transmission of the light in the specific wavelength range from the one side to the other side is provided in the enclosed region. The light control sheet according to 1. The plurality of first refractive index interfaces are arranged to be parallel to each other,
The light control sheet according to claim 1 or 2, wherein the plurality of second refractive index interfaces are arranged to be parallel to each other. A light control sheet that changes the traveling direction of light incident from one side and transmits it to the other side,
A sheet-like body,
A plurality of first portions arranged along one direction on the main body, wherein each first portion is located on one side in one direction and on the other side in the one direction. A plurality of first portions having other sides;
A second portion that contacts the one side surface and the other side surface of the plurality of first portions to form an interface;
A third portion provided at a position between the two first portions adjacent to each other in the one direction and forming an interface in contact with the second portion provided on the two first portions. ,
At the interface between the first part and the second part, the refractive index on the first part side is higher than the refractive index on the second part side,
At the interface between the second part and the third part, the refractive index on the third part side is higher than the refractive index on the second part side,
In the two first portions adjacent in the one direction, the other side surface of the first portion located on one side in the one direction and the one side surface of the first portion located on the other side in the one direction are: A light control sheet that is spaced from the one side toward the other side.   The said 3rd part contains the selective light-shielding part which absorbs or reflects the light of a specific wavelength range, and suppresses the transmission from the said one side to the said other side of the light of the said specific wavelength range. The light control sheet described in 1.   The light control sheet according to claim 4 or 5, wherein the plurality of first portions have the same shape. The light control sheet according to any one of claims 1 to 6,
A joinery comprising: a frame that supports the light control sheet.   A building comprising the light control sheet according to any one of claims 1 to 6 or the joinery according to claim 7.

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